FWIW, my Ethiopic( Ge'ez) text reads like the first(RSV), I will let others tell you as to what the LXX says. and there is a marked difference in meaning between the two translations you sited IMHO.

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To God be the Glory in all things! Amen!

Only pray for me, that God would give me both inward and outward strength, that I may not only speak, but truly will; and that I may not merely be called a Christian, but really be found to be one. St.Ignatius of Antioch.Epistle to the Romans.

The meaning is different, wouldn't you say?One says that the act itself of "smite" or "rebuke" or "strike" is to be in a gentle or 'kind' fashion.The other says that the result or consequence of this "rebuke" or "smite" is a kindness or a good thing for the person who was smacked of course.

I would say the RSV is the more correct version as it more closely follows the LXX (or at least the Breton version I have.) The NKJV follows the KJV and the MT used there. The bolded text from both verses seem to say pretty much the same thing, but obviously the rest of the verse seems to differ; again, the RSV seems to follow the LXX more closely whilst the NKJV follows the MT.